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While ikiwiki supports hierarchically categorising pages by creating [[SubPages|ikiwiki/SubPage]], that’s often not flexible enough, and it can also be useful to tag pages in various non-hierarchical ways.
Since this is a wiki, tagging is just a form of linking. The general rule is that all tags are links, but not all links are tags. So a tag is a special link that ikiwiki knows is intended to be used as a tag.
Generally you will tag a page without putting a visible link on it. The [[!iki plugins/tag desc=“tag plugin”]] allows you to do so, like this:
\[[!tag mytag othertag thirdtag]]
You can also tag a page with a visible link:
This tag will be displayed just like a regular [[ikiwiki/WikiLink]].
One way to use these tags is to create a [[blog]] of pages that have a particular set of tags. Or just look at the [[BackLinks]] to a tag page to see all the pages that are tagged with it. [[Plugins]] can be written to do anything else with tags that you might desire.
Once you have tags, you can use the [[!iki plugins/pagestats]] plugin to generate tag clouds.